Rotary pivoted hammer



H. M. PLAISTED ROTARY PIVOTED HAMMER f Aprf 22 1924.

Filed March 15,

qu/cantar fw m Patented Apr. 22, 19214.

UNITED STATES eran Fl E.,

HAROLD M. PLAISTED, 0F ST. LOUIS, MISSOURI, ASSIGNOR 'lpO VTIIJLIAVli/.IS PATENT CRUSHER & P'UIVERIZER COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

ROTARY rrvo'rnn HAMMER.

vApplication led March 15, 1923. Serial No. 625,309.

To all wlw/mit may concern:

Be it known that I, HAROLD M. PLAIs'rED,

a citizen of the United States, residing atmers for Shredders and other reducing ma' chines, the peculiarities of which will be hereinafter fully described and claimed.

The main object of my invention is to provide a reversible three-pronged insert piece for a rotary pivoted hammer adapted kto be mounted in multiple in a rotor and enclosing casing of a reducing machine, and especially adapted for shredding alfalfa., herbage and like material; secondly, to prolong the life of said hammer by providing three points in succession brought to operative position as they we-ar out in use.

In the accompanying drawing on which like reference numerals indicate corresponding parts, Fig. 1 represents a side face view of a' hammer exemplifying my invention, with hammer support and cage indicated by dotted lines; Fig. 2, a front edge view of the same; Fig. 3, a side face view of the insert piece alone; and Fig. 4, an edge view of said piece for a relatively thin shank.

1 designates a flat bar shank having a hole 2 for pivotal mounting on va rod in a disc mounted in multiple on a rotor shaft the axis of which, designated 3, is parallel to the axis et on which the said hammer is pivoted. The shank is preferably relatively thin as shown i-n Fig. 2, such as fig thick by 2% width, and in the front outer corner of the head of said shank is formed a recess 5 of such shape as to receive an insert piece 6 which is mounted therein. This insert piece has three prongs 7 which are equidistant from the center and from each other. Each prong has a front edge surface 8 that is curved from the point inward towards the center, and then outward to form the back 9 of the next prong, till it intersects the outer edge 10 that is inclined inward towards the center to give clearance to the point 11. Each prong is thus tapering and is symmetrical with the others, so that each may be inserted in the corresponding recess 5 of the hammer head which tapers to the rear from the front edge 12 of the shank,

and follows the curve ofthe insert piece so that one point 11 of the insert piece is disposed at the front edge.'12 of the shank, while Vanother, outer point 11 is located considerably in frontof the front edge of the shank in the operative position shown in Fig. 1, thus presenting the curved side edge 8 to the material being reduced. Theedge surface 10 of the point in operative position is continued by the end surface 13 of the head end of the shank, giving clearance between the cage and the hammer as indicated by the broken curved line 14: struck from the pivot center axis 4. The general direction of the hammers and` rotor is indicated by the arrow l5.

Suitable fastening means areV provided for the insert piece, such as rivets 16 passin through matching notches 17 and 18 forme respectively in the edge surface of the recess and the edge surface of the insert piece, and preferably countersunk as indicated. These notches in the insert piece are located on a circle 19 Fig. 3, from the center of the said piece, so that each prong in succession may be brought to Vrearward position in the re cess and be secured by rivets through the openings formed by the matching notches. As shown in Fig. 1, the two rivets holding the tapering prong' prevent 'said prong from leaving the recess, while the rivets near the outer and inner prongs maintain the respective prongs in the plane of the shank as shown in Fig. 2. The tapering shape of each prong and the location of the prongs as shown in Fig. 1, pro-vide a design of hammer that is especially effective in reducing alfalfa, herbage, and like material.

I claim:

1. A rotary pivoted hammer comprising a shank adapted for pivotal mounting and having a recess in the front outer corner, a symmetrical three-prong insert piece mounted in said recess so that one prong'projects forward o-f the front edge of the shank in operative position, and means for detachably securing said piece in said recess.

2. A rotary pivoted hammer comprising a shank adapted for pivotal mounting and having a recess at its front outer corner, a symmetrical three-pronged insert piece mounted in said recess so that one prong projects forward of the front edge of the shank in operative position, ano-ther prong is disposed adjacent to the front edge of the shank and the third prong extends to the rear into .said recess, and fastening means detachably securing said piece in said recess.

3. A rotary pivoted hammer comprising a shank adapted for pivotal mounting and having a recess at its front outer corner, a symmetrical reversible three-pronged insert piece mounted in said recess,-each, prong tapering to an acute cutting point forming operative edges successively disposed in operative. position, and having notches matching corresponding notches on said recess forming openings to receive fasteningrivets-and fastening means mounted in said openings and detachable means for securing said insert piece, substantially as described.

4. ln a rotary pivoted hammer, a. reversible insert piece consisting of three symmetrically disposed prongs having acute points equidistant from the center and adapted to forni three successive operative edges,-said prongs having not-ches for fastening rivets located equidistant from the center of the piece on the side edges of said prongs7 substantially as and for the purpose described In testimony whereof 'l have afiixed my signature.

HAROLD M. PLAISTLED. 

